package com.atguigu.gulimall.seckill.scheduled;

import com.atguigu.gulimall.seckill.service.SeckillService;
import lombok.extern.slf4j.Slf4j;
import org.redisson.api.RLock;
import org.redisson.api.RedissonClient;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.scheduling.annotation.Async;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.util.concurrent.TimeUnit;

/**
 * @Author : Jungle
 * @Description :
 * 秒杀商品定时上架
 * 每天晚上晚上3点上架最近三天需要秒杀的商品
 * 当天：00:00:00 - 23:59:59
 * 明天：00:00:00 - 23:59:59
 * 后天：00:00:00 - 23:59:59
 */
@Slf4j
@Service
public class SeckillSkuScheduled {
    @Autowired
    private SeckillService seckillService;
    @Autowired
    private RedissonClient redissonClient;

    public static final String UPLOAD_LOCK = "seckill:upload:lock";


    // TODO: 2022/8/16 幂等性处理，上架了不用再上架了
    @Async
    @Scheduled(cron = "0 */5 * * * ?")
    public void uploadSeckillSkuLatest3Days() {
        //1、重复上架无需处理
        DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");
        log.info("上架秒杀的商品信息==>{}",formatter.format(LocalDateTime.now()));
        /** 
         * 1、使用分布式锁，让多节点只有一个机器执行
         */
        //    分布式锁   锁的业务执行完成，状态已经更新完成，释放锁以后，其他人获取到就会拿到最新的状态
        RLock redissonClientLock = redissonClient.getLock(UPLOAD_LOCK);
        redissonClientLock.lock(10, TimeUnit.SECONDS);

        //
        try {
            seckillService.uploadSeckillSkuLatest3Days();
        } finally {
            if (redissonClientLock.isLocked() && redissonClientLock.isHeldByCurrentThread()) {
                redissonClientLock.unlock();
            }
        }

    }
}
